基坑开挖诱发邻近盾构隧道管片开裂机理研究  

Mechanism of adjacent shield tunnel segment cracking induced by foundation pit excavation

作　　者：周惠聪 黄阜 聂波浪 罗跃龙 ZHOU Huicong;HUANG Fu;NIE Bolang;LUO Yuelong(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《交通科学与工程》2024年第6期74-81,共8页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(51878074);湖南省自然科学基金项目(2021JJ30714)。

摘　　要：为了研究基坑开挖诱发邻近既有盾构隧道管片的开裂机理和裂缝分布特征,利用ABAQUS软件构建既有地铁盾构隧道周边新建基坑工程的有限元模型,并基于扩展有限元理论分析了基坑与隧道之间的距离、基坑开挖深度以及基坑与隧道的相对位置等因素对盾构隧道管片裂缝分布规律的影响。研究结果表明:随着基坑与隧道之间距离的缩小以及基坑开挖深度的增加,盾构隧道管片的裂缝长度和数量呈增长趋势,且开裂区域逐步扩大;相较于其他工况,当基坑位于盾构隧道上方时,基坑施工诱发盾构隧道管片开裂的情况更为严重。To study the mechanism of adjacent shield tunnel segment cracking induced by foundation pit excavation and crack distribution characteristics,this paper establishes the finite element model of the new foundation pit project around the existing subway shield tunnel with ABAQUS software.Based on the extended finite element theory,the paper analyzes the influences of the distance between the foundation pit and the tunnel,the excavation depth of the foundation pit,and the relative position between the foundation pit and the tunnel on the crack distribution of the shield tunnel segment.The results show that with the decrease of the distance between the foundation pit and the tunnel and the increase of the excavation depth of the foundation pit,the length and number of cracks of the shield tunnel segment are increasing,and the cracking area expands gradually.The shield tunnel segment cracking induced by foundation pit construction is more serious when the foundation pit is located above the shield tunnel,compared with that under other working conditions.

关 键 词：基坑开挖 邻近盾构隧道 管片开裂 扩展有限元 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]